content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.operators;
  
  import java.io.IOException;
  import java.util.List;
  import java.util.concurrent.*;
  
  import org.junit.*;
  import org.reactivestreams.*;
  
  import hu.akarnokd.rxjava3.basetypes.Solo;
  import hu.akarnokd.rxjava3.test.TestHelper;
  import io.reactivex.rxjava3.core.Flowable;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.internal.subscriptions.BooleanSubscription;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  
  public class FlowableFilterAsyncTest {
  
      @Test
      public void normal() {
          Flowable.range(1, 10)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.just(v % 2 == 0).delay(100, TimeUnit.MILLISECONDS);
              }
          }))
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(2, 4, 6, 8, 10);
      }
  
      @Test
      public void normalSync() {
          Flowable.range(1, 10)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.just(v % 2 == 0).hide();
              }
          }))
          .test()
          .assertResult(2, 4, 6, 8, 10);
      }
  
      @Test
      public void normalSyncFused() {
          Flowable.range(1, 10)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.just(v % 2 == 0);
              }
          }))
          .test()
          .assertResult(2, 4, 6, 8, 10);
      }
  
      @Test
      public void allEmpty() {
          Flowable.range(1, 10)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.<Boolean>empty().hide();
              }
          }))
          .test()
          .assertResult();
      }
  
      @Test
      public void allEmptyFused() {
          Flowable.range(1, 10)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.<Boolean>empty();
              }
          }))
          .test()
          .assertResult();
      }
  
      @Test
      public void empty() {
          Flowable.<Integer>empty()
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.<Boolean>just(true);
              }
          }))
          .test()
          .assertResult();
      }
  
      @Test
      public void emptyBackpressured() {
          Flowable.<Integer>empty()
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.<Boolean>just(true);
              }
          }))
          .test(0L)
          .assertResult();
      }
  
      @Test
      public void error() {
          Flowable.<Integer>error(new IOException())
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.<Boolean>just(true);
              }
          }))
          .test()
          .assertFailure(IOException.class);
      }
  
      @Test
      public void errorBackpressured() {
          Flowable.<Integer>error(new IOException())
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.<Boolean>just(true);
              }
          }))
          .test(0L)
          .assertFailure(IOException.class);
      }
  
      @Test
      public void backpressureExactlyOne() {
          Flowable.just(1)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.<Boolean>just(true);
              }
          }))
          .test(1)
          .assertResult(1);
      }
  
      @Test
      public void longSourceSingleStep() {
          Flowable.range(1, 1000)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.<Boolean>just(true);
              }
          }))
          .rebatchRequests(1)
          .test()
          .assertValueCount(1000)
          .assertNoErrors()
          .assertComplete();
      }
  
      @Test
      public void longSource() {
          Flowable.range(1, 1000)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.<Boolean>just(true).hide();
              }
          }))
          .test()
          .assertValueCount(1000)
          .assertNoErrors()
          .assertComplete();
      }
  
      @Test
      public void longSourceFused() {
          Flowable.range(1, 1000)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.<Boolean>just(true);
              }
          }))
          .test()
          .assertValueCount(1000)
          .assertNoErrors()
          .assertComplete();
      }
  
      @Test
      public void oneAndErrorInner() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              Flowable.just(1)
              .compose(FlowableTransformers.filterAsync(new Function<Object, Publisher<Boolean>>() {
                  @Override
                  public Publisher<Boolean> apply(Object v) throws Exception {
                      return new Flowable<Boolean>() {
                          @Override
                          public void subscribeActual(Subscriber<? super Boolean> s) {
                              s.onSubscribe(new BooleanSubscription());
                              s.onNext(true);
                              s.onError(new IOException());
                          }
                      };
                  }
              }, 16))
              .test()
              .assertResult(1);
  
              TestHelper.assertUndeliverable(errors, 0, IOException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void predicateThrows() {
          Flowable.just(1)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  throw new IOException();
              }
          }))
          .test()
          .assertFailure(IOException.class);
      }
  
      @Test
      public void predicateNull() {
          Flowable.just(1)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return null;
              }
          }))
          .test()
          .assertFailure(NullPointerException.class);
      }
  
      @Test
      public void predicateError() {
          Flowable.just(1)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.<Boolean>error(new IOException()).hide();
              }
          }))
          .test()
          .assertFailure(IOException.class);
      }
  
      @Test
      public void predicateErrorFused() {
          Flowable.just(1)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.fromCallable(new Callable<Boolean>() {
                      @Override
                      public Boolean call() throws Exception {
                          throw new IOException();
                      }
                  });
              }
          }))
          .test()
          .assertFailure(IOException.class);
      }
  
      @Test
      public void take() {
          Flowable.range(1, 10)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.just(v % 2 == 0).hide();
              }
          }))
          .take(1)
          .test()
          .assertResult(2);
      }
  
      @Test
      public void take1Cancel() {
          TestSubscriber<Object> ts = new TestSubscriber<Object>() {
              @Override
              public void onNext(Object t) {
                  super.onNext(t);
                  cancel();
                  onComplete();
              }
          };
  
          Flowable.range(1, 1000)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.just(true).hide();
              }
          }))
          .subscribe(ts);
  
          ts.assertResult(1);
      }
  
      @Test
      public void take1CancelBackpressured() {
          TestSubscriber<Object> ts = new TestSubscriber<Object>(1) {
              @Override
              public void onNext(Object t) {
                  super.onNext(t);
                  cancel();
                  onComplete();
              }
          };
  
          Flowable.range(1, 1000)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Flowable.just(true).hide();
              }
          }))
          .subscribe(ts);
  
          ts.assertResult(1);
      }
  
      @Test
      public void cancel() {
          final PublishProcessor<Boolean> pp = PublishProcessor.create();
  
          Flowable.range(1, 5)
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return pp;
              }
          }, 16))
          .test()
          .cancel();
  
          Assert.assertFalse(pp.hasSubscribers());
      }
  
      @Test
      public void filterAllOut() {
          final int[] calls = { 0 };
  
          Flowable.range(1, 1000)
          .doOnNext(new Consumer<Integer>() {
              @Override
              public void accept(Integer v) throws Exception {
                  calls[0]++;
              }
          })
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Solo.just(false);
              }
          }, 16))
          .flatMap(Functions.justFunction(Flowable.just(0)))
          .test()
          .assertResult();
  
          Assert.assertEquals(1000, calls[0]);
      }
  
      @Test
      public void filterAllOutHidden() {
          final int[] calls = { 0 };
  
          Flowable.range(1, 1000)
          .doOnNext(new Consumer<Integer>() {
              @Override
              public void accept(Integer v) throws Exception {
                  calls[0]++;
              }
          })
          .compose(FlowableTransformers.filterAsync(new Function<Integer, Publisher<Boolean>>() {
              @Override
              public Publisher<Boolean> apply(Integer v) throws Exception {
                  return Solo.just(false).hide();
              }
          }, 16))
          .flatMap(Functions.justFunction(Flowable.just(0)))
          .test()
          .assertResult();
  
          Assert.assertEquals(1000, calls[0]);
      }
  }
  